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*
* Portions of this software were developed by the Unidata Program at the
* University Corporation for Atmospheric Research.
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package ucar.nc2.iosp.grib;
/**
* from https://github.com/lost-carrier 6/12/2014
*/
import static org.junit.Assert.assertEquals;
import java.io.IOException;
import org.junit.Test;
import ucar.nc2.grib.QuasiRegular;
public class TestQuasiRegular {
private static final double x1d = 1.0e30; /* derivative of the first end point */
private static final double xnd = 1.0e30; /* derivative of the nth end point */
@Test
public void testCubicSpline() throws IOException {
float[] in = new float[]{0.0f, 9.0f, 18.0f, 27.0f};
double[] d2 = new double[4];
QuasiRegular.secondDerivative(in, 0, 4, x1d, xnd, d2);
float[] out = new float[8];
QuasiRegular.cubicSpline(in, 0, d2, 0.0, out, 0);
assertEquals(0.0, out[0], 0.0);
QuasiRegular.cubicSpline(in, 0, d2, 0.5, out, 1);
assertEquals(4.5, out[1], 0.0);
QuasiRegular.cubicSpline(in, 0, d2, 1.0, out, 2);
assertEquals(9.0, out[2], 0.0);
QuasiRegular.cubicSpline(in, 0, d2, 1.5, out, 3);
assertEquals(13.5, out[3], 0.0);
QuasiRegular.cubicSpline(in, 0, d2, 2.0, out, 4);
assertEquals(18.0, out[4], 0.0);
QuasiRegular.cubicSpline(in, 0, d2, 2.5, out, 5);
assertEquals(22.5, out[5], 0.0);
QuasiRegular.cubicSpline(in, 0, d2, 3.0, out, 6);
assertEquals(27.0, out[6], 0.0);
QuasiRegular.cubicSpline(in, 0, d2, 3.5, out, 7);
assertEquals(13.5, out[7], 0.0);
}
}